Consistently use singular for packages which contain mixed kinds of
classes. Moved a few classes to packages that better fit them.

We now use the format property instead as type ID for Jackson. A custom
TypeIdResolver is used for the mapping.

`skip` has a huge impact on performance and is not intended for
pagination. Bookmarks perform much better.

Additionally, increased socket timeout for migrations.

Additionally, added log warnings for skipped entities.

Before migrations are run we now make sure that the database is empty or
that a MigrationState document exists. If that is not the case,
maintanence mode is activated to prevent data loss.

Startup failed before if no second database for migration was available.

Fixes #19.

Add support for sub paths and remove restriction of HTTP methods.

This was causing issues with aliases containing dots.

Entities can now be retrieved interally without authorization checks. In
this case, the entity is marked for internal use and serialization is
prohibited.

Fixes regression introduced by commit
7eec95ae.

Tom Käsler authored 7 years ago and Daniel Gerhardt committed 6 years ago

Currently supports finding comments by `roomId`.

See !83.

This fixes get for multiple IDs and find.

This enables the manipulation of Contents before creation/update and
ContentGroups of Rooms after creation/update for API v3.

This enables the manipulation of Comments (creatorId) before creation
for API v3.

Closes !80.

These methods allow additonal application logic based on an created/
updated entity.

Tom Käsler authored 7 years ago and Daniel Gerhardt committed 6 years ago

See !77.

Spring Platform has been upgraded to the "Cairo" release.
This introduces new framework/library versions including:
* Spring Framework 5.0
* Spring Security 5.0
* Spring Integration 5.0
* Spring Data "Kay"
* Jackson 2.9

The following code changes were made as part of the migration:
* CouchDbCrudRepository uses new method names of CrudRepository.
  An extended version of CrudRepository is used to ease the migration
  process.
* AppConfig implements WebMvcConfigurer instead of extending
  WebMvcConfigurerAdapter.
* Servlet Filter and Maven exclusions for logging have been removed.

References:
https://spring.io/blog/2017/09/28/spring-framework-5-0-goes-ga
https://github.com/spring-projects/spring-framework/wiki/What%27s-New-in-Spring-Framework-5.x
https://github.com/spring-projects/spring-framework/wiki/Upgrading-to-Spring-Framework-5.x
https://docs.spring.io/spring-framework/docs/5.0.x/spring-framework-reference/
https://docs.spring.io/spring-security/site/docs/5.0.x/reference/html/new.html
https://spring.io/blog/2017/10/02/spring-data-release-train-kay-goes-ga
https://docs.spring.io/spring-data/data-commons/docs/2.0.x/reference/html/
https://github.com/FasterXML/jackson/wiki/Jackson-Release-2.9

The Java default of handling .properties files as ISO 8859-1 encoded is
not contemporary anymore.

This is used by RoomController to allow requests to /room/~{shortId}.

This enables the manipulation of Rooms (shortId, ownerId) before
creation/updating for API v3.

EntityService can now retrieve the existing entity by itself before
updates.

These methods allow to perform actions based on the entity before the
CRUD operation is executed.

Additionally, added AnswerController for API v3.